Burner and nozzle therefor



April 9, 1929. w. MCCLELLAN 1,708,483

BURNER AND NOZZLE THEREFOR Filed July 26. 1927 lllllllll 9 llllllllllllllllllllllllll ATTORNEY Patented Apr. .9, 1929.

UNITED STATES PATENT OFFICE.

WILLIAM MCCLELLAN, OF NEW YORK, NY., ASSIGNOR TO STEAM PRODUCTION COR- PORATION, F NEW YORK, N. Y.,

A CORPORATION 0F DELAWARE.

BURNER AND NOZZLE THEREFOR.

Application led July 26,

This invention relates to burners for steam boilers and particularly that type of boiler adapted to be used with steam driven vehicles.

One of the objects of the invent-ion is to provide a burner nozzle which will not roar or whistle when fuel is passing therethrough at high velocity.

Another object of the invention .is to provide a burner nozzle which will permit burning With an extremely low flame Without the danger 4of back firing.-

Another object of the invention is to provide a burner nozzle which is adapted to permit sudden changes in the pressure of the fuel flowing therethrough Without danger of back tiring.

Another object of the invention is to provide a burner nozzle in which the gas is permitted to expand into a suitable reservoir before passing out of theA orifices thereof.

Another object of the invention is to provide a burner nozzle which will be maintained at a' minimum temperature While the burner is in operation.

Another object of the invent-ion is to provide a burner nozzle which is readily adapted to bemounted in conjunction with refractory material and which is so constructed asl to form a means to secure the refractory material in place.

Other objects of the invention and particularly objects relating to economies of manufacture will be apparent as the description of the invention proceeds.

One embodiment of the inventionhas been illustrated in the accompanying draw-A ings in which,

Fig. 1 is aasectional side elevation of the portion of the boiler embodying my invention;

Fig. 2 is a sectional plan view of a portion of the burner;

Fig. 3 is an enlarged sectional elevation through a portion of the burner; and

lFig. 4 is a plan view of one of the nozz es.

The invention has been illustrated in connection with a boiler such as shown and described in the application of Frank J. Curran, entitled Boiler construction, Serial No. 175,474, filed March 15th, 1927. In this boiler, a pair of Water drums are adapted to receive feed water through pipe 1927. Serial' No. 208,473.

11 which may be in the form of a coil l2 surrounding the combustion space of the 'boiler in order to heat the feed Water p assing into the drums 10. Heated Wat-er from the drums 10 passes upwardly through a plurality of pipes 13 into a steam drum (not shown) from which water may circulate through the downtake pipes 14 emptying into one of the drums 10. The steam may be taken from the steam drum and brought down through the combustion chamber by a pipe 15 which may be Wound in the'form of a coil 16 adjacent the burnv forced through a suitable atoniizer 24 which may have a central fuel pipe 25 surrounded by an air pipe 26. The plate 18 is provided with a plurality of threaded openings 27 which are adapted to receive the nozzles 28. These lnozzles comprise a tubular member having a Hat top 29 and may be threaded at the lower end, as at 30, to fit the threaded openings 27 in the plat-e 18. The Walls of the nozzles 28 extend outwardly from the threaded end 30 toward the flat top 29 to form an expanding chamber or reservoir 31. lThe flat top 29 is provided With a plurality of holes 32 through which the fuel is adapted to pass and upon the outer edge of which it is adapted to burn. The flat top 29 of the nozzle may be provided if desired, with four or six sides so as to fit a wrench which may be used to screw the nozzle into one of the openings in the plate. Refractory material 33, preferably applied in a plastc condition, may be placed adjacent the upper surface of the plate 18 and surrounding the nozzles 28 and when -so placed the nozzles due to their conical shape provide means to hold the refractory material securely against the plate 18 without danger of being jarred away therefrom by the vibration of the vehicle.

A nozzle such as described which gave excellent results `was provided With a three eights of an inch (?/8) inlet opening expanding to live-eights of an inch (if/8) adjacent the hat top in a distance of iveeighths of an inch (5/3) and had thirtythree holes drilled in the top, each hole being .04 of an inch in diameter.

Any number of such nozzles may be used in this burner although I have found it desirable to provide as many as can be conveniently spaced on the plate 28 still leaving room to fit a Wrench over the top of the nozzle.

In the operation of the burner, the gas enters the mixing chamber 23 where it is thoroughly mixed and delivered to the nozzles 28 in the proper condition for burning. As it enters the expanding chamber 31 in each nozzle the gas expands slightly, there by absorbing heat from the walls of the burner tending to maintain the burner at a minimum temperature. This expanding chamber 3l acts as a reservoir andprovides a cushioning effect on the gas as it passes therethrough which entirely eliminates any whistling of the gas and also prevents back firing when the gas is burning with an extremely low iame at the opening 32., Because of this reservoir also, the pressure may be suddenly varied in the burner without danger of back firing.,

While I have shown a nozzle having threaded connection with the plate 18, `it may be desirable toprovide a smooth end on the nozzle in place of the threads 30 and press the nozzle into place in a snugly litting opening in the plate and in this case it would not be necessary to provide a hexagonal top 29.

The nozzle may be made of any desirable material, although I have found it preterable to use cast iron for this purpose.

Many modifications of the invention may spirit of the invention, and I do not desire to limit myself, therefore, to the specific' construction shown, but to interpret the invention broadly within the scope of the appended claims.

Having thus described my invention, what I claim is:

1. In a gas burner, a mixing chamber, a plurality ot' burner nozzles, each nozzle comprising a gas reservoir and a plurality of burner orifices communicating therewith and refractory material surrounding said nozzles and held in place thereby,

2. In a gas burner, a mixing chamber having a bowl-shaped upper wall with a plurality of openings therein, a nozzle attached to and communicating with each opening, each, of said nozzles comprising an expansion chamber and `a plurality of burner oriices communicating therewith, and refractory material against the top of said wall and surrounding said nozzles, said material being held in place by said nozzles.

23. In a gas burner, a mixing chamber having a concave howlshaped upper wall with a plurality ot' openings therein, a nozzle connected to each oiisaid openings comprising an inverted frustro conical tubular member with a liat top and a 'plurality of burner orifices therein and refractory material upon said Wall and held in place by said nozzles.

4. In a gas burner, a mixing chamber having a concave bowl-shaped 'top with a plurality ol openings therein, refractory material upon said top and a .plurality ot' nozzles threaded into openings in said top and having the formation of an inverted frustum of a cone whereby the refractory material is held in place.

In testimony whereof, I aiix mv signature.

WM. MCCIELLAN. Y 

